Adds pause and unpause-commands

Signed-off-by: Frank Sachsenheim <funkyfuture@riseup.net>

docs/reference/pause.md

@@ -0,0 +1,18 @@
+<!--[metadata]>
++++
+title = "pause"
+description = "Pauses running containers for a service."
+keywords = ["fig, composition, compose, docker, orchestration, cli, pause"]
+[menu.main]
+identifier="pause.compose"
+parent = "smn_compose_cli"
++++
+<![end-metadata]-->
+
+# pause
+
+```
+Usage: pause [SERVICE...]
+```
+
+Pauses running containers of a service. They can be unpaused with `docker-compose unpause`.